U.S. patent number 9,494,222 [Application Number 14/392,063] was granted by the patent office on 2016-11-15 for hydrostatic and direct drive transmission.
This patent grant is currently assigned to Dana Italia S.p.A.. The grantee listed for this patent is DANA ITALIA SPA. Invention is credited to Ettore Cosoli, Luca Gilardino, Giulio Ornella, Nicola Tessaro, Mark R. J. Versteyhe.
United States Patent |
9,494,222 |
Versteyhe , et al. |
November 15, 2016 |
Hydrostatic and direct drive transmission
Abstract
A hydrostatic driveline is provided. The hydrostatic driveline
comprises a power source, a hydrostatic pump, a hydrostatic motor,
a direct drive link, and a transmission portion. The power source
is drivingly engaged with an input member. The hydrostatic pump is
in driving engagement with the input member. The hydrostatic motor
is in fluid communication with the hydrostatic pump. The direct
drive link is in driving engagement with the input member. The
transmission portion is in driving engagement with a vehicle output
and at least one of the hydrostatic motor and the direct drive link
The transmission portion includes at least one engagement device
and a drive ratio. The hydrostatic pump, the hydrostatic motor, and
the transmission portion form a first power path for the
hydrostatic driveline and the direct drive link forms a second
power path for the hydrostatic driveline.
Inventors: |
Versteyhe; Mark R. J.
(Oostkamp, BE), Gilardino; Luca (Riv del Garda,
IT), Ornella; Giulio (Arco, IT), Tessaro;
Nicola (Arco, IT), Cosoli; Ettore (Padua,
IT) |
Applicant: |
Name |
City |
State |
Country |
Type |
DANA ITALIA SPA |
Arco |
N/A |
IT |
|
|
Assignee: |
Dana Italia S.p.A. (Arco (TN),
IT)
|
Family
ID: |
50071628 |
Appl.
No.: |
14/392,063 |
Filed: |
February 11, 2014 |
PCT
Filed: |
February 11, 2014 |
PCT No.: |
PCT/EP2014/052640 |
371(c)(1),(2),(4) Date: |
July 28, 2015 |
PCT
Pub. No.: |
WO2014/122322 |
PCT
Pub. Date: |
August 14, 2014 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20150377333 A1 |
Dec 31, 2015 |
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Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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61762994 |
Feb 11, 2013 |
|
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61811581 |
Apr 12, 2013 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B60K
17/28 (20130101); F16H 47/02 (20130101); B60K
17/356 (20130101); B60K 17/10 (20130101); F16H
2047/025 (20130101); Y02T 10/60 (20130101) |
Current International
Class: |
F16H
47/02 (20060101); B60K 17/10 (20060101); B60K
17/356 (20060101); B60K 17/28 (20060101) |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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19803510 |
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Sep 1999 |
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DE |
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0026115 |
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Apr 1981 |
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EP |
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0896893 |
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Feb 1999 |
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EP |
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2258576 |
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Dec 2010 |
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EP |
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2264334 |
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Dec 2010 |
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EP |
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2426376 |
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Mar 2012 |
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EP |
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2970908 |
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Aug 2012 |
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FR |
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2010076748 |
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Apr 2010 |
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JP |
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Other References
Gourves et al., Kinematic traction chain for hybrid motor vehicle,
has engaging or disengaging units to engage or disengage mechanical
connection between engine and wheels, where gear ratios of units
are adopted for obtaining optimized output at high speed, Aug. 3,
2012, EPO, FR 2970908 A1, English Abstract. cited by examiner .
Gourves et al., Kinematic traction chain for hybrid motor vehicle,
has engaging or disengaging units to engage or disengage mechanical
connection between engine and wheels, where gear ratios of units
are adopted for obtaining optimized output at high speed, Aug. 3,
2012, EPO, FR 2970908 A1, Machine Translation of Description. cited
by examiner .
Marchand et al., Hydrostatic transmissions with a wide working
range, Apr. 1, 1984, EPO, EP 0026115 A2, English Abstract. cited by
examiner .
Marchand et al., Hydrostatic transmissions with a wide working
range, Apr. 1, 1984, EPO, EP 0026115 A2, Machine Translation of
Description. cited by examiner .
European Patent Office; International Search Report and Written
Opinion of the International Searching Authority; Mar. 17, 2014;
International Application No. PCT/EP2014/052640; EPO, Rijswijk,
Netherlands. cited by applicant .
European Patent Office; International Search Report and Written
Opinion of the International Searching Authority; Jun. 17, 2014;
International Application No. PCT/EP2014/057451; EPO, Rijswijk,
Netherlands. cited by applicant.
|
Primary Examiner: English; James
Attorney, Agent or Firm: Marshall & Melborn, LLC
Parent Case Text
CLAIM OF PRIORITY
The present application claims the benefit of priority to U.S.
Provisional Application No. 61/762,994 filed on Feb. 11, 2013 and
U.S. Provisional Application No. 61/811,581 filed on Apr. 12, 2013,
both of which are incorporated herein in their entirety by
reference.
Claims
What is claimed is:
1. A hydrostatic driveline, comprising: a power source drivingly
engaged with an input member; a hydrostatic pump in driving
engagement with the input member; a first hydrostatic motor in
fluid communication with the hydrostatic pump; a direct drive link
in driving engagement with the input member; a transmission portion
in driving engagement with a vehicle output and at least one of the
first hydrostatic motor and the direct drive link, the transmission
portion including at least one engagement device and a drive ratio,
wherein the hydrostatic pump, the first hydrostatic motor, and the
transmission portion form a first power path for the hydrostatic
driveline and the direct drive link forms a second power path for
the hydrostatic driveline; and a front axle driveline in driving
engagement with a front axle output, the front axle driveline
comprising a second hydrostatic motor in selective fluid
communication with the hydrostatic pump, wherein the second
hydrostatic motor is in driving engagement with a front axle
transmission portion, and the front axle transmission portion is in
driving engagement with the front axle output.
2. The hydrostatic driveline according to claim 1, wherein the
transmission portion is a first transmission portion and the
hydrostatic driveline further comprises a second transmission
portion, the second transmission portion forming a portion of the
second power path.
3. The hydrostatic driveline according to claim 2, wherein the
first transmission portion includes at least three engagement
devices and three drive ratios.
4. The hydrostatic driveline according to claim 2, wherein the
first transmission portion and the second transmission portion
include at least three engagement devices and three drive
ratios.
5. The hydrostatic driveline according to claim 4, wherein at least
one engagement device and a drive ratio forms a portion of both the
first power path and the second power path.
6. The hydrostatic driveline according to claim 1, wherein the
direct drive link includes an engagement device and a drive
ratio.
7. The hydrostatic driveline according to claim 1, wherein the
drive ratio is both a forward drive gear and a reverse drive
gear.
8. The hydrostatic driveline according to claim 2, wherein the
second transmission portion includes two engagement devices, two
drive ratios, and a directional engagement device.
9. The hydrostatic driveline according to claim 1, wherein the
front axle transmission portion includes at least two engagement
devices and two drive ratios.
10. The hydrostatic driveline according to claim 1, further
comprising a second hydrostatic pump, the second hydrostatic pump
in driving engagement with the direct drive link.
11. The hydrostatic driveline according to claim 1, further
comprising a power take off, the power take off in driving
engagement with the direct drive link.
12. The hydrostatic driveline according to claim 1, wherein the
hydrostatic pump is a variable displacement hydrostatic pump and
the first and second hydrostatic motors are fixed displacement
hydrostatic motors.
13. The hydrostatic driveline according to claim 1, wherein the
transmission portion includes at least three engagement devices and
three drive ratios, the direct drive link includes an engagement
device and a drive ratio, and at least one of the drive ratio is
both a forward drive gear and a reverse drive gear.
14. The hydrostatic driveline according to claim 1, wherein the
transmission portion comprises a first transmission portion and a
second transmission portion, the first transmission portion is a
first gearbox, the first gearbox is drivingly engaged with the
first hydrostatic motor, the second transmission portion is a
second gearbox, and the second gearbox is drivingly engaged with
the direct drive link.
Description
FIELD OF THE INVENTION
The present invention relates to hydrostatic drivelines and more
specifically to a hydrostatic drivelines having a direct drive
capability.
BACKGROUND OF THE INVENTION
Hydrostatic transmissions use a hydraulic fluid to transmit power
from a power source (for example, an internal combustion engine) to
a power output (for example, a final drive or a plurality of
wheels). Hydrostatic transmissions are typically used in
agricultural tractors and other off-highway equipment, for example,
forklifts, excavators, earth moving machines, and other
vehicles,
The major benefits of hydrostatic transmissions are a large range
of continuously variable speed, a precise control of traction
effort and speed, and high maneuverability. Each of these benefits
is directly related to vehicle productivity. Other advantages
include high power capability in a compact size, a fast response
related to low inertia, maintaining a controlled speed regardless
of load, high traction force at a low engine speed, flexibility in
packaging, dynamic braking, and simplicity in reversing vehicle
direction. Compared to traditional solutions, such as a
hydrodynamic transmission with a torque converter, hydrostatic
transmissions can provide improved performance. As a non-limiting
example, a wheel loader application may require high
maneuverability and a wide torque and speed conversion range.
Hydrostatic transmissions are not without their drawbacks, however.
Hydrostatic transmissions tend to have a lower overall efficiency,
increased maintenance costs, and increased initial investment cost
compared to conventional gear transmissions. As a result, design
considerations for a given application in a hydrostatic
transmission are very important. As a non-limiting example, a
hydrostatic transmission design can focus on one or more particular
operating modes, such as low speed driving to provide maximum
tractive effort, variable speed operation, or maximum speed
operation. Focusing a design on an operating mode, will increase an
overall efficiency of the transmission and proper sizing of
transmission components will result in a more cost-effective
solution.
A hydrostatic driveline can be divided into many standard
categories based on the characteristics of the hydraulic pump and
the hydraulic motor. The hydrostatic driveline can include a fixed
displacement pump or a variable displacement pump and a fixed
displacement motor or a variable displacement motor. A common
combination amongst hydrostatic drivelines is a driveline
configures with a variable displacement pump and a fixed
displacement motor. In this combination, an output speed is
controlled by varying a displacement of the pump.
To increase versatility of a hydrostatic driveline, such as
including a high output capacity and a wide velocity of operational
ranges, many alternative concepts of hydrostatic drivelines have
been developed to meet such demands. One of the simplest and most
common solutions is to use the hydrostatic transmission with a
mechanical gearbox connected in series, and is shown in FIG. 1. A
hydrostatic driveline 1000 includes a power source 1002 in driving
engagement with a hydrostatic pump 1004. The hydrostatic pump 1004
is in fluid communication with a to hydrostatic motor 1006. The
hydrostatic motor 1006 is in driving engagement with a transmission
1008, which is in driving engagement with a vehicle output 1010. As
shown in FIG. 1, the hydrostatic pump 1004 and the hydrostatic
motor 1006 may be bypassed through the use of a torque converter
1012.
It would be advantageous to develop a hydrostatic driveline that
includes a direct drive capability, which offers the benefits of
increased efficiency at a high speed operating mode while
maintaining the benefits of a hydrostatic drive at a low speed
operating mode.
SUMMARY OF THE INVENTION
Presently provided by the invention, a hydrostatic driveline that
includes a direct drive capability, which offers the benefits of
increased efficiency at a high speed operating mode while
maintaining the benefits of a hydrostatic drive at a low speed
operating mode, has surprisingly been discovered.
In one embodiment, the present invention is directed to a
hydrostatic driveline. The hydrostatic driveline comprises a power
source, a hydrostatic pump, a hydrostatic motor, a direct drive
link, and a transmission portion. The power source is drivingly
engaged with an input member. The hydrostatic pump is in driving
engagement with the input member. The hydrostatic motor is in fluid
communication with the hydrostatic pump. The direct drive link is
in driving engagement with the input member. The transmission
portion is in driving engagement with a vehicle output and at least
one of the hydrostatic motor and the direct drive link. The
transmission portion includes at least one engagement device and a
drive ratio. The hydrostatic pump, the hydrostatic motor, and the
transmission portion form a first power path for the hydrostatic
driveline and the direct drive link forms a second power path for
the hydrostatic driveline.
Various aspects of this invention will become apparent to those
skilled in the art from the following detailed description of the
preferred embodiment, when read in light of the accompanying
drawings.
BRIEF DESCRIPTION OF THE FIGURES
The above, as well as other advantages of the present invention
will become readily apparent to those skilled in the art from the
following detailed description when considered in the light of the
accompanying drawings in which:
FIG. 1 is a schematic illustration of a hydrostatic driveline known
in the prior art;
FIG. 2 is a schematic illustration of a hydrostatic driveline
according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of a variation of the
hydrostatic driveline shown in FIG. 2;
FIG. 4 is a schematic illustration of a variation of the
hydrostatic driveline shown in FIG. 2;
FIG. 5 is a schematic illustration of a variation of the
hydrostatic driveline shown in FIG. 2;
FIG. 6 is a schematic illustration of a variation of the
hydrostatic driveline shown in FIG. 2;
FIG. 7 is a schematic illustration of a variation of the
hydrostatic driveline shown in FIG. 2;
FIG. 8 is a schematic illustration of a variation of the
hydrostatic driveline shown in FIG. 2;
FIG. 9 is a schematic illustration of a variation of the
hydrostatic driveline shown in FIG. 2;
FIG. 10 is a schematic illustration of a variation of the
hydrostatic driveline shown in FIG. 2;
FIG. 11 is a schematic illustration of a hydrostatic driveline
according to another embodiment of the present invention;
FIG. 12 is a schematic illustration of a variation of the
hydrostatic driveline shown in FIG. 11;
FIG. 13 is a schematic illustration of a variation of the
hydrostatic driveline shown in FIG. 11;
FIG. 14 is a schematic illustration of a hydrostatic driveline
according to another embodiment of the present invention; and
FIG. 15 is a schematic illustration of a hydrostatic driveline
according to another embodiment of the present invention, the
hydrostatic driveline including the hydrostatic driveline shown in
FIG. 14.
DETAILED DESCRIPTION OF THE INVENTION
It is to be understood that the invention may assume various
alternative orientations and step sequences, except where expressly
specified to the contrary. It is also to be understood that the
specific devices and processes illustrated in the attached
drawings, and described in the following specification are simply
exemplary embodiments of the inventive concepts defined herein.
Hence, specific dimensions, directions or other physical
characteristics relating to the embodiments disclosed are not to be
considered as limiting, unless expressly stated otherwise.
FIG. 2 illustrates a hydrostatic driveline 2000. The hydrostatic
driveline 2000 includes a power source 2002 in driving engagement
with a hydrostatic pump 2004 and a direct drive link 2006. The
hydrostatic pump 2004 is in fluid communication with a hydrostatic
motor 2008. The hydrostatic motor 2008 is in driving engagement
with a first transmission portion 2010, which is in driving
engagement with a vehicle output 2012. The direct drive link 2006
is in driving engagement with a second transmission portion 2014,
which is in driving engagement with the vehicle output 2012. The
hydrostatic driveline 2000 may be operated in a hydrostatic mode or
a direct drive mode.
The power source 2002 applies power to an input 2016 of the
hydrostatic driveline 2000. The power source 2002 is, for example,
an internal combustion engine; however, it is understood that the
power source 2002 may include an electric motor or another source
of rotational output. It is understood that the power source 2002
may be a hybrid power source including both an internal combustion
engine and an electric motor. Further, it is understood that the
power source 2002 may include an output ratio adjusting device as
known in the art. Further, it is understood that the power source
2002 may include an engagement device (not shown) as known in the
art, for one of reducing and interrupting a rotational force
transferred to the hydrostatic driveline 2000.
The input 2016 is in driving engagement with the power source 2002,
the hydrostatic pump 2004, and the direct drive link 2006. The
input 2016 may be a gear, a plurality of gears, a shaft, or another
type of mechanical connection.
The hydrostatic pump 2004 is a hydraulic axial piston pump having a
movable swashplate (not shown) which varies a displacement thereof.
However, it is understood the hydrostatic pump 2004 may be any
other type of variable displacement pump. As mentioned hereinabove,
the hydrostatic pump 2004 is drivingly engaged with the power
source 2002 through the input 2016. The hydrostatic pump 2004 is in
fluid communication with the hydrostatic motor 2008 through at
least two fluid conduits 2018. As the hydrostatic pump 2004 is
drivingly engaged with the power source 2002, a drive portion of
the hydrostatic pump 2004 always rotates in the same direction as
the power source 2002. A direction of flow through the hydrostatic
pump 2004 is changed by adjusting a swashplate angle of the
hydrostatic pump 2004. By adjusting the swashplate angle of the
hydrostatic pump 2004, a forward and a reverse direction is
provided when the hydrostatic driveline 2000 is operated in the
hydrostatic mode.
The hydrostatic motor 2008 is a fixed displacement hydraulic motor.
However, it is understood the hydrostatic motor 2008 may be another
type of hydraulic motor. The hydrostatic motor 2008 is drivingly
engaged with the first transmission portion 2010. The hydrostatic
motor 2008 is in fluid communication with the hydrostatic pump 2004
through the at least two fluid conduits 2018.
The first transmission portion 2010 is a gearbox drivingly engaged
with the hydrostatic motor 2008 and the vehicle output 2012. The
first transmission portion 2010 includes a first engagement device
2020, a second engagement device 2022, a first drive ratio 2024,
and a second drive ratio 2026. By engaging one of the engagement
devices 2020, 2022, one of the drive ratios 2024, 2026 is selected.
The engagement devices 2020, 2022 are clutches which may be
variably engaged; however, it is understood that other types of
engagement devices may be used. As mentioned hereinabove, by
adjusting the swashplate angle of the hydrostatic pump 2004, the
first transmission portion 2010, and thus the vehicle output 2012,
may be operated in a forward and a reverse direction.
The direct drive link 2006 is a mechanical connection which
facilitates driving engagement between the input 2016 and the
second transmission portion 2014.
The second transmission portion 2014 is a gearbox drivingly engaged
with the direct drive link 2006 and the vehicle output 2012. The
second transmission portion 2014 includes a third engagement device
2028, a fourth engagement device 2030, a fifth engagement device
2032, a third drive ratio 2034, a fourth drive ratio 2036, and a
fifth drive ratio 2038. By engaging one of the engagement devices
2028, 2030, 2032, one of the drive ratios 2034, 2036, 2038 is
selected. The engagement devices 2028, 2030, 2032 are clutches
which may be variably engaged; however, it is understood that other
types of engagement devices may be used. The drive ratios 2034,
3036, 2038 of the second transmission portion 2014 are configured
as two forward drive speeds and one reverse drive speed; however,
it is understood that the second transmission portion 2014 may have
other drive speed arrangements.
In use, the hydrostatic driveline 2000 may be operated in the
hydrostatic mode or the direct drive mode. In either of the drive
modes, only one of the engagement devices 2020, 2022, 2028, 2030,
2032 may be fully engaged at any given instant. In the hydrostatic
mode, the hydrostatic driveline 2000 is operated at lower speeds
using one of the first drive ratio 2024 and the second drive ratio
2026. As mentioned hereinabove, by adjusting the swashplate angle
of the hydrostatic pump 2004, the forward and the reverse direction
is provided to each of the drive ratios 2024, 2026. In the direct
drive mode, the hydrostatic driveline 2000 is operated at higher
speeds using one of the third drive ratio 2034, the fourth drive
ratio 2036, and the fifth drive ratio 2038. As mentioned
hereinabove, the drive ratios 2034, 3036, 2038 of the second
transmission portion 2014 are configured as two forward drive
speeds and one reverse drive speed.
FIG. 3 illustrates a hydrostatic driveline 3000. The hydrostatic
driveline 3000 is a variation of the hydrostatic driveline 2000,
and has similar features thereto. It is also understood that the
hydrostatic driveline 3000 may not illustrate all of the features
of the hydrostatic driveline 2000. The hydrostatic driveline 3000,
however, is a specific embodiment of a hydrostatic driveline that
provides a greater level of detail regarding component orientation
and component configuration than the hydrostatic driveline 2000.
The variation of the invention shown in FIG. 3 includes similar
components to the hydrostatic driveline 2000 illustrated in FIG. 2.
Similar features of the variation shown in FIG. 3 are numbered
similarly in series. Different and additional features of the
variation shown in FIG. 3 can be appreciated by one skilled in the
art in view of FIG. 3 and the hydrostatic driveline 2000
illustrated in FIG. 2. Further, it is understood that a reverse
drive option may be added to a direct drive mode of the hydrostatic
driveline 3000 through the addition of further components to the
hydrostatic driveline 3000.
FIG. 3 illustrates the hydrostatic driveline 3000. The hydrostatic
driveline 3000 includes a power source 3002 in driving engagement
with a hydrostatic pump 3004 and a direct drive link 3006. The
hydrostatic pump 3004 is in fluid communication with a hydrostatic
motor 3008. The hydrostatic motor 3008 is in driving engagement
with a first transmission portion 3010, which is in driving
engagement with a vehicle output 3012. The direct drive link 3006
is in driving engagement with a second transmission portion 3014,
which is in driving engagement with the vehicle output 3012. The
hydrostatic driveline 3000 may be operated in a hydrostatic mode or
the direct drive mode.
The hydrostatic driveline 3000 further comprises an auxiliary pump
3040. The auxiliary pump 3040 is in driving engagement with the
direct drive link 3006. The auxiliary pump 3040 is a fixed
displacement hydraulic pump. However, it is understood the
auxiliary pump 3040 may be another type of hydraulic pump. The
auxiliary pump 3040 may be in fluid communication with the
hydrostatic motor 3008 or an auxiliary device (not shown).
The second transmission portion 3014 further comprises a power take
off 3042. The power take off 3042 is a geared portion of the second
transmission portion 3014 which may be drivingly engaged with an
auxiliary device (not shown).
FIG. 4 illustrates a hydrostatic driveline 4000. The hydrostatic
driveline 4000 is a variation of the hydrostatic driveline 2000,
and has similar features thereto. It is also understood that the
hydrostatic driveline 4000 may not illustrate all of the features
of the hydrostatic driveline 2000. The hydrostatic driveline 4000,
however, is a specific embodiment of a hydrostatic driveline that
provides a greater level of detail regarding component orientation
and component configuration than the hydrostatic driveline 2000.
The variation of the invention shown in FIG. 4 includes similar
components to the hydrostatic driveline 2000 illustrated in FIG. 2.
Similar features of the variation shown in FIG. 4 are numbered
similarly in series. Different and additional features of the
variation shown in FIG. 4 can be appreciated by one skilled in the
art in view of FIG. 4 and the hydrostatic driveline 2000
illustrated in FIG. 2. Further, it is understood that a reverse
drive option may be added to a direct drive mode of the hydrostatic
driveline 4000 through the addition of further components to the
hydrostatic driveline 4000.
FIG. 4 illustrates the hydrostatic driveline 4000. The hydrostatic
driveline 4000 includes a power source 4002 in driving engagement
with a hydrostatic pump 4004 and a direct drive link 4006. The
hydrostatic pump 4004 is in fluid communication with a hydrostatic
motor 4008. The hydrostatic motor 4008 is in driving engagement
with a first transmission portion 4010, which is in driving
engagement with a vehicle output 4012, through a portion of a
second transmission portion 4014. The direct drive link 4006 is in
driving engagement with the second transmission portion 4014, which
is in driving engagement with the vehicle output 4012. The
hydrostatic driveline 4000 may be operated in a hydrostatic mode or
the direct drive mode.
The hydrostatic driveline 4000 further comprises an auxiliary pump
4040.
The auxiliary pump 4040 is in driving engagement with the direct
drive link 4006. The auxiliary pump 4040 is a fixed displacement
hydraulic pump. However, it is understood the auxiliary pump 4040
may be another type of hydraulic pump. The auxiliary pump 4040 may
be in fluid communication with the hydrostatic motor 4008 or an
auxiliary device (not shown).
FIG. 5 illustrates a hydrostatic driveline 5000. The hydrostatic
driveline 5000 is a variation of the hydrostatic driveline 2000,
and has similar features thereto. It is also understood that the
hydrostatic driveline 5000 may not illustrate all of the features
of the hydrostatic driveline 2000. The hydrostatic driveline 5000,
however, is a specific embodiment of a hydrostatic driveline that
provides a greater level of detail regarding component orientation
and component configuration than the hydrostatic driveline 2000.
The variation of the invention shown in FIG. 5 includes similar
components to the hydrostatic driveline 2000 illustrated in FIG. 2.
Similar features of the variation shown in FIG. 5 are numbered
similarly in series. Different and additional features of the
variation shown in FIG. 5 can be appreciated by one skilled in the
art in view of FIG. 5 and the hydrostatic driveline 2000
illustrated in FIG. 2. Further, it is understood that a reverse
drive option may be added to a direct drive mode of the hydrostatic
driveline 5000 through the addition of further components to the
hydrostatic driveline 5000.
FIG. 5 illustrates the hydrostatic driveline 5000. The hydrostatic
driveline 5000 includes a power source 5002 in driving engagement
with a hydrostatic pump 5004 and a direct drive link 5006. The
hydrostatic pump 5004 is in fluid communication with a hydrostatic
motor 5008. The hydrostatic motor 5008 is in driving engagement
with a first transmission portion 5010, which is in driving
engagement with a vehicle output 5012. The direct drive link 5006
is in driving engagement with a second transmission portion 5014,
which is in driving engagement with the vehicle output 5012 through
a portion of a first transmission portion 5010. The hydrostatic
driveline 5000 may be operated in a hydrostatic mode or the direct
drive mode.
The hydrostatic driveline 5000 further comprises an auxiliary pump
5040. The auxiliary pump 5040 is in driving engagement with the
direct drive link 5006.
The auxiliary pump 5040 is a fixed displacement hydraulic pump.
However, it is understood the auxiliary pump 5040 may be another
type of hydraulic pump. The auxiliary pump 5040 may be in fluid
communication with the hydrostatic motor 5008 or an auxiliary
device (not shown).
The hydrostatic driveline 5000 further comprises a power take off
5042. The power take off 5042 is in driving engagement with the
direct drive link 5006 through the auxiliary pump 5040. The power
take off 5042 may be drivingly engaged with an auxiliary device
(not shown).
FIG. 6 illustrates a hydrostatic driveline 6000. The hydrostatic
driveline 6000 is a variation of the hydrostatic driveline 2000,
and has similar features thereto. It is also understood that the
hydrostatic driveline 6000 may not illustrate all of the features
of the hydrostatic driveline 2000. The hydrostatic driveline 6000,
however, is a specific embodiment of a hydrostatic driveline that
provides a greater level of detail regarding component orientation
and component configuration than the hydrostatic driveline 2000.
The variation of the invention shown in FIG. 6 includes similar
components to the hydrostatic driveline 2000 illustrated in FIG. 2.
Similar features of the variation shown in FIG. 6 are numbered
similarly in series. Different and additional features of the
variation shown in FIG. 6 can be appreciated by one skilled in the
art in view of FIG. 6 and the hydrostatic driveline 2000
illustrated in FIG. 2. Further, it is understood that a reverse
drive option may be added to a direct drive mode of the hydrostatic
driveline 6000 through the addition of further components to the
hydrostatic driveline 6000.
FIG. 6 illustrates the hydrostatic driveline 6000. The hydrostatic
driveline 6000 includes a power source 6002 in driving engagement
with a hydrostatic pump 6004 and a direct drive link 6006. The
hydrostatic pump 6004 is in fluid communication with a hydrostatic
motor 6008. The hydrostatic motor 6008 is in driving engagement
with a first transmission portion 6010, which is in driving
engagement with a vehicle output 6012. The direct drive link 6006
is in driving engagement with the second transmission portion 6014,
which is in driving engagement with the vehicle output 6012. The
hydrostatic driveline 6000 may be operated in a hydrostatic mode or
the direct drive mode.
FIG. 7 illustrates a hydrostatic driveline 7000. The hydrostatic
driveline 7000 is a variation of the hydrostatic driveline 2000,
and has similar features thereto. It is also understood that the
hydrostatic driveline 7000 may not illustrate all of the features
of the hydrostatic driveline 2000. The hydrostatic driveline 7000,
however, is a specific embodiment of a hydrostatic driveline that
provides a greater level of detail regarding component orientation
and component configuration than the hydrostatic driveline 2000.
The variation of the invention shown in FIG. 7 includes similar
components to the hydrostatic driveline 2000 illustrated in FIG. 2.
Similar features of the variation shown in FIG. 7 are numbered
similarly in series. Different and additional features of the
variation shown in FIG. 7 can be appreciated by one skilled in the
art in view of FIG. 7 and the hydrostatic driveline 2000
illustrated in FIG. 2. Further, it is understood that a reverse
drive option may be added to a direct drive mode of the hydrostatic
driveline 7000 through the addition of further components to the
hydrostatic driveline 7000.
FIG. 7 illustrates the hydrostatic driveline 7000. The hydrostatic
driveline 7000 includes a power source 7002 in driving engagement
with a hydrostatic pump 7004 and a direct drive link 7006. The
hydrostatic pump 7004 is in fluid communication with a hydrostatic
motor 7008. The hydrostatic motor 7008 is in driving engagement
with a first transmission portion 7010, which is in driving
engagement with a vehicle output 7012. The direct drive link 7006
is in driving engagement with the second transmission portion 7014,
which is in driving engagement with the vehicle output 7012. The
hydrostatic driveline 7000 may be operated in a hydrostatic mode or
the direct drive mode.
The hydrostatic driveline 7000 further comprises a power take off
7042. The power take off 7042 is in driving engagement with the
direct drive link 7006. The power take off 7042 may be drivingly
engaged with an auxiliary device (not shown).
FIG. 8 illustrates a hydrostatic driveline 8000. The hydrostatic
driveline 8000 is a variation of the hydrostatic driveline 2000,
and has similar features thereto. It is also understood that the
hydrostatic driveline 8000 may not illustrate all of the features
of the hydrostatic driveline 2000. The hydrostatic driveline 8000,
however, is a specific embodiment of a hydrostatic driveline that
provides a greater level of detail regarding component orientation
and component configuration than the hydrostatic driveline 2000.
The variation of the invention shown in FIG. 8 includes similar
components to the hydrostatic driveline 2000 illustrated in FIG. 2.
Similar features of the variation shown in FIG. 8 are numbered
similarly in series. Different and additional features of the
variation shown in FIG. 8 can be appreciated by one skilled in the
art in view of FIG. 8 and the hydrostatic driveline 2000
illustrated in FIG. 2. Further, it is understood that a reverse
drive option may be added to a direct drive mode of the hydrostatic
driveline 8000 through the addition of further components to the
hydrostatic driveline 8000.
FIG. 8 illustrates the hydrostatic driveline 8000. The hydrostatic
driveline 8000 includes a power source 8002 in driving engagement
with a hydrostatic pump 8004 and a direct drive link 8006. The
hydrostatic pump 8004 is in fluid communication with a hydrostatic
motor 8008. The hydrostatic motor 8008 is in driving engagement
with a first transmission portion 8010, which is in driving
engagement with a vehicle output 5012 through a second transmission
portion 8014. The direct drive link 8006 is in driving engagement
with the second transmission portion 8014, which is in driving
engagement with the vehicle output 8012. The hydrostatic driveline
8000 may be operated in a hydrostatic mode or the direct drive
mode.
The hydrostatic driveline 8000 further comprises an auxiliary pump
8040. The auxiliary pump 8040 is in driving engagement with the
direct drive link 8006. The auxiliary pump 8040 is a fixed
displacement hydraulic pump. However, it is understood the
auxiliary pump 8040 may be another type of hydraulic pump. The
auxiliary pump 8040 may be in fluid communication with the
hydrostatic motor 8008 or an auxiliary device (not shown).
The hydrostatic driveline 8000 further comprises a power take off
8042. The power take off 8042 is in driving engagement with the
direct drive link 8006 through the auxiliary pump 8040. The power
take off 8042 may be drivingly engaged with an auxiliary device
(not shown).
FIG. 9 illustrates a hydrostatic driveline 9000. The hydrostatic
driveline 9000 is a variation of the hydrostatic driveline 2000,
and has similar features thereto. It is also understood that the
hydrostatic driveline 9000 may not illustrate all of the features
of the hydrostatic driveline 2000. The hydrostatic driveline 9000,
however, is a specific embodiment of a hydrostatic driveline that
provides a greater level of detail regarding component orientation
and component configuration than the hydrostatic driveline 2000.
The variation of the invention shown in FIG. 9 includes similar
components to the hydrostatic driveline 2000 illustrated in FIG. 2.
Similar features of the variation shown in FIG. 9 are numbered
similarly in series. Different and additional features of the
variation shown in FIG. 9 can be appreciated by one skilled in the
art in view of FIG. 9 and the hydrostatic driveline 2000
illustrated in FIG. 2. Further, it is understood that a reverse
drive option may be added to a direct drive mode of the hydrostatic
driveline 9000 through the addition of further components to the
hydrostatic driveline 9000.
FIG. 9 illustrates the hydrostatic driveline 9000. The hydrostatic
driveline 9000 includes a power source 9002 in driving engagement
with a hydrostatic pump 9004 and a direct drive link 9006. The
hydrostatic pump 9004 is in fluid communication with a hydrostatic
motor 9008. The hydrostatic motor 9008 is in driving engagement
with a first transmission portion 9010, which is in driving
engagement with a vehicle output 9012. The direct drive link 9006
is in driving engagement with a second transmission portion 9014,
which is in driving engagement with the vehicle output 9012. The
hydrostatic driveline 9000 may be operated in a hydrostatic mode or
the direct drive mode.
The hydrostatic driveline 9000 further comprises a power take off
9042. The power take off 9042 is in driving engagement with the
direct drive link 9006. The power take off 9042 may be drivingly
engaged with an auxiliary device (not shown).
FIG. 10 illustrates a hydrostatic driveline 10000. The hydrostatic
driveline 10000 is a variation of the hydrostatic driveline 2000,
and has similar features thereto. It is also understood that the
hydrostatic driveline 10000 may not illustrate all of the features
of the hydrostatic driveline 2000. The hydrostatic driveline 10000,
however, is a specific embodiment of a hydrostatic driveline that
provides a greater level of detail regarding component orientation
and component configuration than the hydrostatic driveline 10000.
The variation of the invention shown in FIG. 10 includes similar
components to the hydrostatic driveline 2000 illustrated in FIG. 2.
Similar features of the variation shown in FIG. 10 are numbered
similarly in series. Different and additional features of the
variation shown in FIG. 10 can be appreciated by one skilled in the
art in view of FIG. 10 and the hydrostatic driveline 2000
illustrated in FIG. 2. Further, it is understood that a reverse
drive option may be added to a direct drive mode of the hydrostatic
driveline 10000 through the addition of further components to the
hydrostatic driveline 10000.
FIG. 10 illustrates the hydrostatic driveline 10000. The
hydrostatic driveline 10000 includes a power source 10002 in
driving engagement with a hydrostatic pump 10004 and a direct drive
link 10006. The hydrostatic pump 10004 is in fluid communication
with a hydrostatic motor 10008. The hydrostatic motor 10008 is in
driving engagement with a first transmission portion 10010, which
is in driving engagement with a vehicle output 10012, through a
portion of a second transmission portion 10014. The direct drive
link 10006 is in driving engagement with the second transmission
portion 10014, which is in driving engagement with the vehicle
output 10012. The hydrostatic driveline 10000 may be operated in a
hydrostatic mode or the direct drive mode.
The hydrostatic driveline 10000 further comprises an auxiliary pump
10040. The auxiliary pump 10040 is in driving engagement with the
direct drive link 10006.
The auxiliary pump 10040 is a variable displacement hydraulic pump.
However, it is understood the auxiliary pump 10040 may be another
type of hydraulic pump. The auxiliary pump 10040 may be in fluid
communication with the hydrostatic motor 10008 or an auxiliary
device (not shown).
FIG. 11 illustrates a hydrostatic driveline 11000 according to
another embodiment of the invention. The hydrostatic driveline
11000 includes a power source 11002 in driving engagement with a
hydrostatic pump 11004 and a direct drive link 11050. The
hydrostatic pump 11004 is in fluid communication with a hydrostatic
motor 11008. The hydrostatic motor 11008 is in driving engagement
with a transmission portion 11052, which is in driving engagement
with a vehicle output 11012. The direct drive link 11050 is in
driving engagement with the transmission portion 11052, which is in
driving engagement with the vehicle output 11012. The hydrostatic
driveline 11000 may be operated in a hydrostatic mode or a direct
drive mode.
The power source 11002 applies power to an input 11016 of the
hydrostatic driveline 11000. The power source 11002 is, for
example, an internal combustion engine; however, it is understood
that the power source 11002 may include an electric motor or
another source of rotational output. It is understood that the
power source 11002 may be a hybrid power source including both an
internal combustion engine and an electric motor. Further, it is
understood that the power source 11002 may include an output ratio
adjusting device as known in the art. Further, it is understood
that the power source 11002 may include an engagement device (not
shown) as known in the art, for one of reducing and interrupting a
rotational force transferred to the hydrostatic driveline 2000.
The input 11016 is in driving engagement with the power source
11002, the hydrostatic pump 11004, and the direct drive link 11050.
The input 11016 may be a gear, a plurality of gears, a shaft, or
another type of mechanical connection.
The hydrostatic pump 11004 is a hydraulic axial piston pump having
a movable swashplate (not shown) which varies a displacement
thereof. However, it is understood the hydrostatic pump 11004 may
be any other type of variable displacement pump. As mentioned
hereinabove, the hydrostatic pump 11004 is drivingly engaged with
the power source 11002 through the input 11016. The hydrostatic
pump 11004 is in fluid communication with the hydrostatic motor
11008 through at least two fluid conduits 11018. As the hydrostatic
pump 11004 is drivingly engaged with the power source 11002, a
drive portion of the hydrostatic pump 11004 always rotates in the
same direction as the power source 11002. A direction of flow
through the hydrostatic pump 11004 is changed by adjusting a
swashplate angle of the hydrostatic pump 11004. By adjusting the
swashplate angle of the hydrostatic pump 11004, a forward and a
reverse direction is provided when the hydrostatic driveline 11000
is operated in the hydrostatic mode.
The hydrostatic motor 11008 is a fixed displacement hydraulic
motor. However, it is understood the hydrostatic motor 11008 may be
another type of hydraulic motor. The hydrostatic motor 11008 is
drivingly engaged with the transmission portion 11052. The
hydrostatic motor 11008 is in fluid communication with the
hydrostatic pump 11004 through the at least two fluid conduits
11018.
The transmission portion 11052 is a gearbox drivingly engaged with
the hydrostatic motor 11008, the direct drive link 11050, and the
vehicle output 11012. The transmission portion 11052 includes a
first engagement device 11020, a second engagement device 11022, a
third engagement device 11024, a fourth engagement device 11026, a
first drive ratio 11028, a second drive ratio 11030, a third drive
ratio 11032, and a fourth drive ratio 11034. The engagement devices
11020, 11022, 11024, 11026 are clutches which may be variably
engaged; however, it is understood that other types of engagement
devices may be used. By engaging one of the engagement devices
11020, 11022, 11024, 11026, one of the drive ratios 11028, 11030,
11032, 11034 is selected. As mentioned hereinabove, by adjusting
the swashplate angle of the hydrostatic pump 11004, a portion of
the transmission portion 11052, and thus the vehicle output 11012,
may be operated in a forward and a reverse direction. The drive
ratios 11028, 11030, 11032, 11034 of the transmission portion 11052
are configured as two forward or reverse drive speeds, one forward
drive speed, and one reverse drive speed; however, it is understood
that the transmission portion 11052 may have other drive speed
arrangements. Further, it is understood that the drive ratios
11028, 11030 may be configured for use only in the hydrostatic mode
and that the drive ratios 11032, 11034 may be configured for use
only in the direct drive mode.
The direct drive link 11050 is a mechanical connection which
facilitates driving engagement between the input 11016 and the
transmission portion 11052. The direct drive link 11050 includes a
direct drive engagement device 11054 and a direct drive ratio
adjuster 11056. By engaging the direct drive engagement device
11054, the input 11016 is directly drivingly engaged with the
transmission portion 11052, and a drive ratio therebetween is
adjusted through the direct drive ratio adjuster 11056. The direct
drive engagement device 11054 is engaged when the hydrostatic
driveline 11000 is operated in the direct drive mode.
In use, the hydrostatic driveline 11000 may be operated in the
hydrostatic mode or the direct drive mode. In either of the drive
modes, only one of the engagement devices 11020, 11022, 11024,
11026 may be fully engaged at any given instant. In the hydrostatic
mode, the hydrostatic driveline 11000 is operated at lower speeds
using one of the first drive ratio 11028 and the second drive ratio
11030. As mentioned hereinabove, by adjusting the swashplate angle
of the hydrostatic pump 11004, the forward and the reverse
direction is provided to each of the drive ratios 11028, 11030. In
the direct drive mode, the hydrostatic driveline 11000 is operated
at higher speeds using the direct drive ratio adjuster 11056 and
one of the second drive ratio 11030, the third drive ratio 11032,
and the fourth drive ratio 11034. Accordingly, the second
engagement device 11022 and the second drive ratio 11030 may be
used in either of the drive modes. As mentioned hereinabove, the
drive ratios 11028, 11030, 11032, 11034 of the transmission portion
11052 are configured as two forward or reverse drive speeds, one
forward drive speed, and one reverse drive speed.
FIG. 12 illustrates a hydrostatic driveline 12000. The hydrostatic
driveline 12000 is a variation of the hydrostatic driveline 11000,
and has similar features thereto. It is also understood that the
hydrostatic driveline 12000 may not illustrate all of the features
of the hydrostatic driveline 11000. The hydrostatic driveline
12000, however, is a specific embodiment of a hydrostatic driveline
that provides a greater level of detail regarding component
orientation and component configuration than the hydrostatic
driveline 11000. The variation of the invention shown in FIG. 12
includes similar components to the hydrostatic driveline 11000
illustrated in FIG. 11. Similar features of the variation shown in
FIG. 12 are numbered similarly in series. Different and additional
features of the variation shown in FIG. 12 can be appreciated by
one skilled in the art in view of FIG. 12 and the hydrostatic
driveline 11000 illustrated in FIG. 11. Further, it is understood
that a reverse drive option may be added to a direct drive mode of
the hydrostatic driveline 12000 through the addition of further
components to the hydrostatic driveline 12000.
FIG. 12 illustrates a hydrostatic driveline 12000. The hydrostatic
driveline 12000 includes a power source 12002 in driving engagement
with a hydrostatic pump 12004 and a direct drive link 12050. The
hydrostatic pump 12004 is in fluid communication with a hydrostatic
motor 12008. The hydrostatic motor 12008 is in driving engagement
with a transmission portion 12052, which is in driving engagement
with a vehicle output 12012. The direct drive link 12050 is in
driving engagement with the transmission portion 12052, which is in
driving engagement with the vehicle output 12012. The hydrostatic
driveline 12000 may be operated in a hydrostatic mode or the direct
drive mode.
FIG. 13 illustrates a hydrostatic driveline 13000. The hydrostatic
driveline 13000 is a variation of the hydrostatic driveline 11000,
and has similar features thereto. It is also understood that the
hydrostatic driveline 13000 may not illustrate all of the features
of the hydrostatic driveline 11000. The hydrostatic driveline
13000, however, is a specific embodiment of a hydrostatic driveline
that provides a greater level of detail regarding component
orientation and component configuration than the hydrostatic
driveline 11000. The variation of the invention shown in FIG. 13
includes similar components to the hydrostatic driveline 11000
illustrated in FIG. 11. Similar features of the variation shown in
FIG. 13 are numbered similarly in series. Different and additional
features of the variation shown in FIG. 13 can be appreciated by
one skilled in the art in view of FIG. 13 and the hydrostatic
driveline 11000 illustrated in FIG. 11. Further, it is understood
that a reverse drive option may be added to a direct drive mode of
the hydrostatic driveline 13000 through the addition of further
components to the hydrostatic driveline 13000.
FIG. 13 illustrates a hydrostatic driveline 13000. The hydrostatic
driveline 13000 includes a power source 13002 in driving engagement
with a hydrostatic pump 13004 and a direct drive link 13050. The
hydrostatic pump 13004 is in fluid communication with a hydrostatic
motor 13008. The hydrostatic motor 13008 is in driving engagement
with a transmission portion 13052, which is in driving engagement
with a vehicle output 13012. The direct drive link 13050 is in
driving engagement with the transmission portion 13052, which is in
driving engagement with the vehicle output 13012. The hydrostatic
driveline 13000 may be operated in a hydrostatic mode or the direct
drive mode.
FIG. 14 illustrates a hydrostatic driveline 14000 according to
another embodiment of the invention. The hydrostatic driveline
14000 includes a power source 14002 in driving engagement with a
hydrostatic pump 14004 and a direct drive link 14006. The
hydrostatic pump 14004 is in fluid communication with a hydrostatic
motor 14008. The hydrostatic motor 14008 is in driving engagement
with a first transmission portion 14010, which is in driving
engagement with a vehicle output 14012. The direct drive link 14006
is in driving engagement with a second transmission portion 14014,
which is in driving engagement with the vehicle output 14012. The
hydrostatic driveline 14000 may be operated in a hydrostatic mode
or a direct drive mode.
The power source 14002 applies power to an input 14016 of the
hydrostatic driveline 14000. The power source 14002 is, for
example, an internal combustion engine; however, it is understood
that the power source 14002 may include an electric motor or
another source of rotational output. It is understood that the
power source 14002 may be a hybrid power source including both an
internal combustion engine and an electric motor. Further, it is
understood that the power source 14002 may include an output ratio
adjusting device as known in the art. Further, it is understood
that the power source 14002 may include an engagement device (not
shown) as known in the art, for one of reducing and interrupting a
rotational force transferred to the hydrostatic driveline
14000.
The input 14016 is in driving engagement with the power source
14002, the hydrostatic pump 14004, and the direct drive link 14006.
The input 14016 may be a gear, a plurality of gears, a shaft, or
another type of mechanical connection.
The hydrostatic pump 14004 is a hydraulic axial piston pump having
a movable swashplate (not shown) which varies a displacement
thereof. However, it is understood the hydrostatic pump 14004 may
be any other type of variable displacement pump. As mentioned
hereinabove, the hydrostatic pump 14004 is drivingly engaged with
the power source 14002 through the input 14016. The hydrostatic
pump 14004 is in fluid communication with the hydrostatic motor
14008 through at least two fluid conduits 14018. As the hydrostatic
pump 14004 is drivingly engaged with the power source 14002, a
drive portion of the hydrostatic pump 14004 always rotates in the
same direction as the power source 14002. A direction of flow
through the hydrostatic pump 14004 is changed by adjusting a
swashplate angle of the hydrostatic pump 14004. By adjusting the
swashplate angle of the hydrostatic pump 14004, a forward and a
reverse direction is provided when the hydrostatic driveline 14000
is operated in the hydrostatic mode. The hydrostatic motor 14008 is
a fixed displacement hydraulic motor.
However, it is understood the hydrostatic motor 14008 may be
another type of hydraulic motor. The hydrostatic motor 14008 is
drivingly engaged with the first transmission portion 14010. The
hydrostatic motor 14008 is in fluid communication with the
hydrostatic pump 14004 through the at least two fluid conduits
14018.
The first transmission portion 14010 is a gearbox drivingly engaged
with the hydrostatic motor 14008 and the vehicle output 14012. The
first transmission portion 14010 includes a first engagement device
14020, a second engagement device 14022, a first drive ratio 14024,
and a second drive ratio 14026. By engaging one of the engagement
devices 14020, 14022, one of the drive ratios 14024, 14026 is
selected. The engagement devices 14020, 14022 are clutches which
may be variably engaged; however, it is understood that other types
of engagement devices may be used. As mentioned hereinabove, by
adjusting the swashplate angle of the hydrostatic pump 14004, the
first transmission portion 14010, and thus the vehicle output
14012, may be operated in a forward and a reverse direction.
The direct drive link 14006 is a mechanical connection which
facilitates driving engagement between the input 14016 and the
second transmission portion 14014.
The second transmission portion 14014 is a gearbox drivingly
engaged with the direct drive link 14006 and the vehicle output
14012. The second transmission portion 14014 includes a third
engagement device 14028, a fourth engagement device 14030, a first
directional engagement device 14032, a second directional
engagement device 14034, a third drive ratio 14036, a fourth drive
ratio 14038, a first directional drive ratio 14040, and a second
directional drive ratio 14042. By engaging one of the engagement
devices 14028, 14030, and one of the directional engagement devices
14032, 14034, one of the drive ratios 14036, 14038 and one of the
directional drive ratios 14040, 14042 is selected. The engagement
devices 14028, 14030, 14032, 14034 are clutches which may be
variably engaged; however, it is understood that other types of
engagement devices may be used. The drive ratios 14036, 14038 of
the second transmission portion 14014 are configured as two drive
speeds. The directional engagement devices 14032, 14034 and the
directional drive ratios 14040, 14042 are configured to provide a
forward and a reverse selection for either of the drive ratios
14036, 14038. It is understood, however, that the second
transmission portion 2014 may have other drive speed and
directional arrangements.
In use, the hydrostatic driveline 14000 may be operated in the
hydrostatic mode or the direct drive mode. In either of the drive
modes, only one of the engagement devices 14020, 14022, 14028,
14030 may be fully engaged at any given instant. In the hydrostatic
mode, the hydrostatic driveline 14000 is operated at lower speeds
using one of the first drive ratio 14024 and the second drive ratio
14026. As mentioned hereinabove, by adjusting the swashplate angle
of the hydrostatic pump 14004, the forward and the reverse
direction is provided to each of the drive ratios 14024, 14026. In
the direct drive mode, the hydrostatic driveline 14000 is operated
at higher speeds using one of the third drive ratio 14036 and the
fourth drive ratio 14038. In the direct drive mode, a forward and a
reverse selection is performed by engaging one of the first
directional engagement device 14032 and the second directional
engagement device 14034.
FIG. 15 illustrates a hydrostatic driveline 15000 according to
another embodiment of the invention. The hydrostatic driveline
15000 includes the hydrostatic driveline 2000 and a front axle
driveline 15100; however, it is understood that the hydrostatic
driveline 15000 may be configured with any of the hydrostatic
drivelines described hereinabove,
The hydrostatic driveline 2000 is configured as a rear axle
driveline. The fluid conduits 2018 of the hydrostatic driveline
2000 are in fluid communication with the front axle driveline 15100
using at least two valves 15102 and fluid conduits 15104.
The front axle driveline 15100 includes a hydrostatic motor 15106,
an input 15108, and a front axle transmission 15110. The front axle
driveline 15100 is in driving engagement with a front axle output
15112. The hydrostatic pump 2004 is in fluid communication with the
hydrostatic motor 15106 through the at least two valves 15102 and
fluid conduits 15104. The hydrostatic motor 15106 is in driving
engagement with the front axle transmission 15110, which is in
driving engagement with the front axle output 15112. The front axle
driveline 15100 is operated in a hydrostatic mode when a vehicle
(not shown) the hydrostatic driveline 15000 is incorporated in is
placed in a dual axle driving mode. The dual axle driving mode may
be a four wheel drive mode.
The input 15108 is in driving engagement with the hydrostatic motor
15106 and the front axle transmission 15110. The input 15108 may be
a gear, a plurality of gears, a shaft, or another type of
mechanical connection.
The front axle transmission 15110 is a gearbox drivingly engaged
with the input 15108 and the front axle output 15112. The front
axle transmission portion 15110 includes a first front engagement
device 15114, a second front engagement device 15116, a first drive
ratio 15118, and a second drive ratio 15120. By engaging one of the
engagement devices 15114, 15116, one of the drive ratios 15118,
15120 is selected. The engagement devices 15114, 15116 are clutches
which may be variably engaged; however, it is understood that other
types of engagement devices may be used. The drive ratios 15118,
15120 of the front axle transmission 15110 are configured as two
drive speeds, and the drive ratios 15118, 15120 correspond to the
drive ratios 2024, 2026 of the hydrostatic driveline 2000. It is
understood, however, that the front axle transmission 15110 may
have other drive speed and directional arrangements.
In use, the hydrostatic driveline 15000 may be operated in the
hydrostatic mode or the direct drive mode. In the hydrostatic mode,
the front axle transmission 15110 may be engaged via the valves
15102 to increase a tractive effort of the vehicle the hydrostatic
driveline 15000 is incorporated in. In the direct drive mode, the
front axle transmission 15110 is disengaged through closing the
valves 15102, allowing the hydrostatic driveline 2000 to drive the
vehicle through the direct drive link 2006 and the transmission
portion 2014.
The hydrostatic driveline 2000, 3000, 4000, 5000, 6000, 7000, 8000,
9000, 10000, 11000, 12000, 13000, 14000, 15000 offers many
advantages over simple hydrostatic transmissions and hydrodynamic
transmissions. The hydrostatic driveline 2000, 3000, 4000, 5000,
6000, 7000, 8000, 9000, 10000, 11000, 12000, 13000, 14000, 15000
offers improved performance in the form of high tractive effort for
launching a vehicle incorporating the driveline 2000, 3000, 4000,
5000, 6000, 7000, 8000, 9000, 10000, 11000, 12000, 13000, 14000,
15000 due to the hydrostatic portion. Further, a maximum traction
force at low speeds remains regardless of an amount of power used
auxiliary devices. The hydrostatic driveline 2000, 3000, 4000,
5000, 6000, 7000, 8000, 9000, 10000, 11000, 12000, 13000, 14000,
15000 provides continuously variable capabilities at low speeds,
provides high maneuverability, precise speed control, and speed
variability (for example, a torque-speed conversion range) to the
vehicle. The hydrostatic driveline 2000, 3000, 4000, 5000, 6000,
7000, 8000, 9000, 10000, 11000, 12000, 13000, 14000, 15000 also
simplifies reversing a direction of the vehicle by reversing a flow
of the hydrostatic pump 2004, 3004, 4004, 5004, 6004, 7004, 8004,
9004, 10004, 11004, 12004, 13004, 14004. The hydrostatic driveline
2000, 3000, 4000, 5000, 6000, 7000, 8000, 9000, 10000, 11000,
12000, 13000, 14000, 15000 offers robustness and high efficiency at
high speeds thanks to the direct drive mode. Lastly, the
hydrostatic driveline 2000, 3000, 4000, 5000, 6000, 7000, 8000,
9000, 10000, 11000, 12000, 13000, 14000, 15000 offers reduced fuel
consumption through the selection of optimal operating modes, which
is further supported by improved productivity due to increased
performance and maneuverability of the vehicle.
In accordance with the provisions of the patent statutes, the
present invention has been described in what is considered to
represent its preferred embodiments. However, it should be noted
that the invention can be practiced otherwise than as specifically
illustrated and described without departing from its spirit or
scope.
* * * * *